JFreeChart XYbar图形，条形之间没有边距

Question

如何在JFreeChart中创建XYBarChart，条形之间没有任何空格？我可以使用XYBarDataset.setBarWidth()手动设置宽度，但通过反复试验，我无法消除差距。

我的图表目前看起来像：

以下代码：

XYSeries series = new XYSeries("XYGraph");
    for (int i = 0; i < fileData[0].length; i++) {
        series.add(fileData[0][i], fileData[comboNumber][i]);
    }

    XYSeriesCollection dataset = new XYSeriesCollection();
    dataset.addSeries(series);
    XYBarDataset barDataset = new XYBarDataset(dataset, 13);

    JFreeChart chart = ChartFactory.createXYBarChart("Power Profile", "Time (m)", false, "Power (kW)", barDataset, PlotOrientation.VERTICAL, false, true, false);
    chart.setBackgroundPaint(null);

    XYPlot plot = (XYPlot) chart.getPlot();
    ValueAxis yAxis = plot.getRangeAxis();
    yAxis.setRange(0, findPeak(0, fileData[0].length, 0, fileData.length, -1, true).getValue() + 5);
    plot.setBackgroundPaint(Color.white);
    plot.setRangeGridlinesVisible(true);
    plot.setDomainGridlinesVisible(true);
    plot.setRangeGridlinePaint(Color.black);
    plot.setDomainGridlinePaint(Color.black);

    panel.removeAll();
    panel.setLayout(new java.awt.BorderLayout());
    ChartPanel CP = new ChartPanel(chart);
    CP.setSize(panel.getSize());

    panel.add(CP,BorderLayout.CENTER);
    panel.validate();
    this.repaint();

附加说明：要绘制的条形数量不断变化。